+// Defining _BSD_SOURCE or _DEFAULT_SOURCE causes header files to expose
+// definitions that may otherwise be skipped. Skipping can cause implicit
+// declaration warnings and/or bugs and subtle problems in code execution.
+// For glibc information on feature test macros,
+// Refer http://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html
+//
+// This file requires #define use due to random()
+// For details on compatibility and glibc support,
+// Refer http://www.gnu.org/software/libc/manual/html_node/BSD-Random.html
+#define _DEFAULT_SOURCE
+
+// Defining _POSIX_C_SOURCE macro with 199309L (or greater) as value
+// causes header files to expose definitions
+// corresponding to the POSIX.1b, Real-time extensions
+// (IEEE Std 1003.1b-1993) specification
+//
+// For this specific file, see use of clock_gettime,
+// Refer to http://pubs.opengroup.org/stage7tc1/functions/clock_gettime.html
+// and to http://man7.org/linux/man-pages/man2/clock_gettime.2.html
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+#endif
+
+#ifdef __TIZENRT__
+#include <tinyara/config.h>
+#endif
+
+#include "iotivity_config.h"